Abstract
The safety hazards of lightning to seismic crews using explosives are well known. Lightning is a result of high potential gradients in the atmosphere. These high gradients, which accompany stormy weather, can be detected by measuring the corona‐discharge current from a sharp metal point called a point collector. Oscillograms of point‐collector currents taken during thunderstorms may be a definite aid to field personnel in determining when lightning is imminent. Many more data are needed. It is hoped that others in the industry will take similar measurements and pool the data thus obtained.
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